Astm d 2092 95 (2001)e1

Designation: D 2092 – 95 (Reapproved 2001)e1

Standard Guide for

Preparation of Zinc-Coated (Galvanized) Steel Surfaces for

Painting1

This standard is issued under the fixed designation D 2092; the number immediately following the designation indicates the year of

original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A

superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense.

e1 NOTE—Footnote 3 was corrected editorially in June 2001.

1. Scope

1.1 This guide describes eight methods of treating new

zinc-coated (galvanized) surfaces produced by either the hot￾dip method or by electroplating. This practice covers surfaces

that have not been treated previously at the mill to provide

temporary protection against staining by moisture other than by

easily removed protective oils (see Appendix X1).

1.2 The values stated in SI units are to be regarded as the

standard. The values given in parentheses are for information

only.

1.3 This standard does not purport to address all of the

safety concerns, if any, associated with its use. It is the

responsibility of the user of this standard to establish appro￾priate safety and health practices and determine the applica￾bility of regulatory limitations prior to use.

2. Referenced Documents

2.1 ASTM Standards:

D 1193 Specification for Reagent Water2

2.2 Steel Structures Painting Council Specification:

Paint No. 27 Basic Zinc Chromate-Vinyl Butyrol Wash

Primer3

3. Summary of Guide

3.1 This guide describes treatment methods that provide

galvanized surfaces suitable for painting, specifically so that an

applied coating system can develop the adhesion necessary for

satisfactory service life.

3.2 Eight methods of surface preparation (Note 1 and Note

2) are covered as follows:

3.2.1 Method A—Zinc Phosphate Treatment.

3.2.2 Method B—Chromate Treatment.

3.2.3 Method C—Aqueous Chromic-Organic Treatment.

3.2.4 Method D—Acid-Curing Resinous Treatment.

3.2.5 Method E—Annealing Heat Treatments.

3.2.6 Method F—Amorphous Complex-Oxide Treatment.

3.2.7 Method G—Abrasive Blast Cleaning.

3.2.8 Method H—Fluro-Titanic/Zirconic Polymer Treat￾ment.

NOTE 1—Materials employed in these methods of treatment are avail￾able from a number of sources as proprietary compounds or methods.

Selection may be made from available sources.

NOTE 2—The use of solvents containing volatile organic compounds to

prepare or treat the surface of metal components contributes to air

pollution in the same manner as the use of solvent containing paints and

coatings. The user of this standard must determine the applicability of

appropriate regulations governing the volatile organic compound content

of the materials used in a shop application (Miscellaneous Metal Parts),

field painting (Architectural), or specific process industry.

3.3 Variations in surface preparation produce end conditions

that differ, hence do not necessarily yield identical results when

paints are subsequently applied. Service conditions will dictate

the type of surface preparation to be selected, although the

quality produced by any individual method may vary with

different zinc coatings.

3.4 Galvanized surfaces are treated by using various meth￾ods and apparatus; satisfactory application may be made at the

following locations:

Mill Plant Field

Method A Y Y Y

Method B Y Y ...

Method C Y Y ...

Method D Y Y Y

Method E Y ... ...

Method F Y Y ...

Method G Y Y Y

Method H Y Y ...

3.5 This guide does not describe the cleaning necessary to

provide a zinc-coated (galvanized) surface suitable for the

application of the treatments. Many cleaning methods are

applicable and should be agreed upon between the purchaser

and the supplier.

NOTE 3—Most producers of zinc-coated (galvanized) steel sheets and

coils have adopted the practice of applying an inhibitor to the zinc surface

to give temporary protection against staining by moisture during shipping

or storage. Some of these inhibitors interfere with proper reaction of most

1 This guide is under the jurisdiction of ASTM Committee D01 on Paint and

Related Coatings, Materials, and Applications and is the direct responsibility of

Subcommittee D01.46 on Industrial Protective Coatings.

Current edition approved April 15, 1995. Published June 1995. Originally

published as D 2092 – 86. Last previous edition D 2092 – 86 (1993). 2 ASTM Book of Standards, Vol 11.01. 3 Available from The Society For Protective Coatings (SSPC), 2100 Wharton St.,

Suite 310, Pittsburgh, PA 15203–1951.

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